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- Not to be confused with Stamp.
Penguin Mail Stamps are stamps stuck in every postcard you receive. There are currently four kinds of stamps.
Kinds of Stamps
- 10 Coin Stamp- The most common stamp. You get this on all of the mail you receive.
- Ninja 10 Coin Stamp- A rare stamp which you get when you earn a white belt, black belt, and the blue belt.
- 50 Coin Stamp- A rare and special stamp you get when you receive a postcard from Sensei.
- Moss Key 10 Coin Stamp- A rare stamp seen in a mail given by Rockhopper.